// -------------------------------------------------------------------------------------------------------
// LICENSE INFORMATION
//
// - This software is licensed under the MIT shared source license.
// - The "official" source code for this project is maintained at http://oncfext.codeplex.com
//
// Copyright (c) 2010-2012 OpenNETCF Consulting
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
// associated documentation files (the "Software"), to deal in the Software without restriction, 
// including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, 
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial 
// portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT 
// NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
// -------------------------------------------------------------------------------------------------------
using System.Runtime.InteropServices;

namespace System
{
    public static class ByteArrayExtensions
    {
        public static T ToStruct<T>(this byte[] buffer)
            where T : struct
        {
            return ToStruct<T>(buffer, 0);
        }

        public static T ToStruct<T>(this byte[] buffer, int start)
            where T : struct
        {
            var type = typeof(T);
            var minLength = Marshal.SizeOf(type);
            if ((buffer.Length - start) < minLength)
            {
                throw new ArgumentException("buffer is too small");
            }

            // pin the buffer
            var handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);

            try
            {
                return (T)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), type);
            }
            finally
            {
                // release the pin
                handle.Free();
            }
        }
    }
}
